Aging mechanism of microplastics with UV irradiation and its effects on the adsorption of heavy metals

微塑料 环境化学 海水 吸附 金属 化学 污染物 重金属 等温过程 辐照 降级(电信) 有机化学 生态学 物理 核物理学 热力学 生物 电信 计算机科学
作者
Ruofan Mao,Mengfan Lang,Xueyang Yu,Renren Wu,Xiaomei Yang,Xuetao Guo
出处
期刊:Journal of Hazardous Materials [Elsevier]
卷期号:393: 122515-122515 被引量:371
标识
DOI:10.1016/j.jhazmat.2020.122515
摘要

Microplastics are formed by the degradation of plastic wastes under the action of physicochemical mechanisms in environment, and they are becoming a new type of pollutant that is attractings global attention. However, research on the aging characteristics and mechanism of microplastics is limited. The aging mechanism of Polystyrene (PS) with UV irradiation under different conditions (air, pure water and seawater) and the effect of aging on heavy metal adsorption were studied. The results show that PS have different characteristics with UV irradiation under different conditions, and the aging of PS is the most obvious in air. Based on the 2D-COS analysis, different aging mechanisms were identified under different aging conditions, aging sequence of aged PS functional groups in air and water were clearly definited. An isothermal adsorption model shows that aging can significantly increase the adsorption of heavy metals by PS. The adsorption of heavy metals is also affected by different aging methods. Over all, a 2D-COS analysis was an effective method for understanding the aging process of PS. These results further clarify the aging mechanism of PS, and provides a theoretical basis for the assessment of environmental behavior and ecological risk when microplastics and heavy metals coexist.
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